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Radiation generating apparatus and radiation imaging apparatus

a radiation generation apparatus and radiation imaging technology, applied in the direction of x-ray tubes, material analysis using wave/particle radiation, instruments, etc., can solve the problem of high potential difference between the radiation shielding member and the envelope, and achieve the effect of suppressing a deterioration in the voltage-withstand performance, preventing a reduction in the amount of radiation, and improving the resistance voltage performan

Inactive Publication Date: 2015-06-30
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]The first window which is provided on the envelope in which the insulating liquid has been filled and the second window which is provided on the radiation tube which is arranged within the envelope may be arranged so as to face each other, with the insulating member arranged between the shielding member which has the radiation passing hole which is in communication with the second window and the inner wall of the envelope. Here, since the insulating member has the opening of the insulating member at the position corresponding to the first window, it is possible to prevent radiation emitted from the radiation tube being absorbed by the insulating member and thus prevent a reduction in the amount of the radiation. Further, since the solid insulating member is provided, the withstand voltage performance is improved at the opening of the insulating member. Furthermore, since the shortest length of the supposed straight line stretching from the shielding member to the first window or the inner wall of the envelope through the opening of the insulating member without intersecting the insulating member is made longer than the shortest length of the supposed straight line stretching from the shielding member to the first window or the inner wall of the envelope as intersecting the insulating member, it is possible to suppress a deterioration in the voltage-withstand performance at the opening of the insulating member. Thus, the voltage-withstand performance as between the radiation tube and the envelope can be obtained even if the distance between the shielding member and the envelope is shortened, whereby it is possible to achieve reduction of size and weight of the apparatus.

Problems solved by technology

However, in this method, a high potential difference occurs between the radiation shielding member and the envelope.
Thus, there is a case where an electric discharge occurs the apparatus is driven during a long time or the like.

Method used

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  • Radiation generating apparatus and radiation imaging apparatus
  • Radiation generating apparatus and radiation imaging apparatus
  • Radiation generating apparatus and radiation imaging apparatus

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Experimental program
Comparison scheme
Effect test

first embodiment

[0017]First of all, the first embodiment of the present invention will be described with reference to FIGS. 1A, 1B and 1C. More specifically, FIG. 1A is the cross-section schematic diagram illustrating a radiation generating apparatus according to the present embodiment, FIG. 1B is the enlarged cross-section schematic diagram illustrating a peripheral part of a radiation shielding member (called a shielding member, hereinafter) 16 and an insulating member 21 both illustrated in FIG. 1A, and FIG. 1C is the schematic diagram of the insulating member 21 and a first window 2 for transmitting radiation which are viewed from the side of the shielding member 16 all illustrated in FIG. 1A.

[0018]The radiation generating apparatus according to the present embodiment is equipped with a transmission-type radiation tube 10 (called a radiation tube, hereinafter), and the radiation tube 10 is held within an envelope 1.

[0019]Here, the radiation tube 10 includes a vacuum container 17, an electron em...

second embodiment

[0038]In the present invention, the shape of the shielding member 16 is not limited to that illustrated in FIGS. 1A to 1C. That is, another shape may be used as the shape of the shielding member.

[0039]Therefore, another example of the shape of the shielding member 16 which can be adopted in the present invention will be described with reference to FIG. 2. FIG. 2 is a cross-section schematic diagram illustrating an enlarged peripheral part of the shielding member 16 and the insulating member 21 in a radiation generating apparatus according to the second embodiment of the present invention. It should be noted that, in the present embodiment, the constituent parts other than the shielding member 16 are the same as those already described in the first embodiment.

[0040]The present embodiment is characterized by the opening area of the radiation passing hole 24 of the shielding member 16 becoming gradually larger from the middle of the radiation passing hole 24 toward the side of the firs...

third embodiment

[0043]In the present invention, the shape of the insulating member 21 is not limited to that illustrated in FIGS. 1A to 1C

[0044]Therefore, another example of the shape of the insulating member 21 which can be adopted in the present invention will be described with reference to FIGS. 3A and 3B. FIG. 3A is a cross-section schematic diagram illustrating an enlarged peripheral part of the shielding member 16 and the insulating member 21 in the radiation generating apparatus according to the third embodiment of the present invention, and FIG. 3B is a schematic diagram of the insulating member 21 and the first window 2 which are viewed from the side of the shielding member 16 all illustrated in FIG. 3A. It should be noted that, in the present embodiment, the constituent parts other than the insulating member 21 are the same as those already described in the first embodiment.

[0045]The present embodiment is characterized by the opening 22 of the insulating member 21 being formed inside the ...

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PUM

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Abstract

In a radiation imaging apparatus, an envelope has a first window for transmitting radiation and is filled with an insulating liquid, and a radiation tube in the envelope has, at a position facing the first window, a second window for transmitting the radiation, and a shielding member. A solid insulating member is arranged between the shielding member and the inner wall of the envelope, and an opening is formed at a position on the insulating member corresponding to the first window. The shortest distance from the shielding member to the first window or the inner wall of the envelope through the opening of the insulating member without the insulating member is made to be longer than the shortest distance from the shielding member to the first window or the inner wall of the envelope through the insulating member, thereby improving withstand voltage performance without reducing an radiation amount.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a radiation generating apparatus which is applicable to non-destructive X-ray photography or the like in the fields of medical equipment and industrial equipment, and a radiation imaging apparatus in which the radiation generating apparatus is used.DESCRIPTION OF THE RELATED ART[0002]In general, a radiation tube accelerates, at a high voltage, electrons emitted from an electron emitting source, and then bombards a target with the accelerated electrons, thereby generating radiation such as X-rays or the like. At this time, the radiation is generated in all directions. In the circumstances, a transmission-type radiation tube in which shielding members are arranged on electron-incident side of the target and a radiation-emitting side has been proposed to shield redundant radiation (Japanese Patent Application Laid-Open No. 2007-265981). In the radiation tube like this, it is unnecessary to cover, by a shielding member such as...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H01J35/08H01J35/12H01J35/14H05G1/06H01J35/18H01J35/16
CPCH01J35/08H01J35/12H01J35/14H01J35/16H01J35/18H05G1/06H01J2235/06H01J2235/087H01J2235/1204H01J2235/1216H01J2235/122H01J2235/1295H01J2235/16H01J2235/167H01J35/116H01J35/186
Inventor TAMURA, MIKIAOKI, SHUJIYANAGISAWA, YOSHIHIROUEDA, KAZUYUKI
Owner CANON KK
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